Near-field and vector signal analysis techniques applied to specific absorption rate measurement

Electromagnetic Inversion for Noninvasive Specific Absorption Rate Characterization

“…Since the number of columns for these matrices is 792 (total number of unknowns), we would expect the rank of the concatenated matrix to be the addition of the individual ranks. 16 What we see instead is a loss of 12 and 14 rows when combining the systems. This indicates that there is some redundant 17 information in C and suggests that at least one of the possible 2D projections for the system would demonstrate the combined ill-posed system shown in the motivation section.…”

“…It is clear that this can reduce the total measurement time by increasing the rate at which the required measurement points are obtained. Of course, we can combine field reconstruction techniques with probe array measurements in order to further reduce the measurement time [16]. In fact, a commercial probe-array SAR measurement system using forward propagation has already been developed and provides very fast measurements [17].…”

“…15 The rank was evaluated using the built-in MATLAB function. 16 If the addition exceeds the number of columns (which it does not in this case), the maximum rank of the concatenation is the number of columns. Note also that this only applies if the number of columns is smaller than the number of rows for the concatenated matrix (which it does in this case).…”

“…16 shows the plots of the reconstructed DUT currents for the balanced substitution and SI methods. It is clear from this figure that the substitution method has Reconstructed DUT currents for the balanced substitution and SI methods.…”

Efficient Experimental Assessment of The Specific Absorption Rate (SAR) Induced by MIMO Wireless Communication Devices; Application of Vector Near-Field Measurement System

“…Near-field vector techniques directly exploit the XXX-X-XXXX-XXXX-X/XX/$XX.00 ©20XX IEEE 978-1-5386-5795-9/18/$31.00 ©2018 IEEE harmonic property o f the electromagnetic field. A corollary of this property is that the knowledge o f amplitude and phase of E-field components (Ex and Ey) tangential to a surface is enough to deduce the three E-field components (x,y,z) in all three dimensions [6][7].…”